| Proper Build London Ltd | Construction | 2023 |
| Properties G&D Ltd | Real estate | 2024 |
| Property Ladder London Ltd | Real estate | 2023 |
| Property LIN Limited | Real estate | 2021 |
| Property Titan Ltd | Real estate | 2023 |
| Propserv Ltd | Construction | 2013 |
| Prorisk Care Consultancy Limited | Professional & scientific | 2014 |
| Proscan Imaging Limited | Health & social care | 2025 |
| Prospera Capital Partners (West) Ltd | Professional & scientific | 2023 |
| Prosperity Consulting Ltd | Wholesale & retail | 2024 |
| Prosperous Mermaids Ltd | Hospitality | 2026 |
| Protos Design Studio Limited | Information & communication | 2014 |
| Protégé DNA | Administrative & support | 2009 |
| Proxima Ventures Ltd | Information & communication | 2024 |
| Prudential Developments Ltd | Construction | 2026 |
| Prudential Properties Ltd | Construction | 2021 |
| PSK Advisory Services Ltd | Professional & scientific | 2021 |
| Psoft Limited | Information & communication | 2010 |
| Psquared Properties Limited | Real estate | 2022 |
| Psychiatry Medicolegal Service Limited | Health & social care | 2019 |
| Ptmj & Company Ltd | Professional & scientific | 2025 |
| Pulled Ltd | Hospitality | 2013 |
| Pure Legend Ltd | Wholesale & retail | 2015 |
| Puro Coconut Limited | Wholesale & retail | 2017 |
| Pythagoras Ltd | Education | 2024 |
| QC Private Equity Services Limited | Financial services | 1999 |
| QF Advisors Limited | Professional & scientific | 2020 |
| Qleanic Holdings Ltd | Financial services | 2025 |
| QR Barber Ltd | Other services | 2019 |
| Quadlobe Limited | Information & communication | 2019 |
| Quantifire Limited | Information & communication | 2012 |
| Quantum Water Corporation Limited | Water & waste | 2017 |
| Quarrying Stonecraft Reclamation Ltd | Construction | 2020 |
| Quartz Kitchen Ltd | Manufacturing | 2021 |
| Quick Tingz Ltd | Hospitality | 2020 |
| Quilliam Property Ltd | Real estate | 2021 |
| Quinta Monteiro Matos Limited | Wholesale & retail | 2024 |
| QVO Group Ltd | Wholesale & retail | 2026 |
| R Cudjoe Limited | Health & social care | 2022 |
| R D London Holdings Limited | Real estate | 2018 |
| R S Estates PVT Limited | Real estate | 2014 |
| R W 1 Build Limited | Construction | 2012 |
| R&A EV Consultants Ltd | Professional & scientific | 2024 |
| R&B Coaching and Wellbeing Ltd | Education | 2023 |
| R&M Architecture Limited | Professional & scientific | 2021 |
| R.K.Gurney Ltd | Professional & scientific | 2014 |
| RA Product Management Services Ltd | Information & communication | 2019 |
| Rabina Ltd | Real estate | 2026 |
| RAD Building Solutions Limited | Construction | 2026 |
| RAD3ANCEM Ltd | Education | 2025 |
| Rada Cafe Limited | Wholesale & retail | 2017 |
| Radiall Ltd | Manufacturing | 1942 |
| Radix Homes Limited | Real estate | 2016 |
| Raees Consulting Limited | Professional & scientific | 2026 |
| RAH Infotech Limited | Information & communication | 2014 |
| Rahma Garments Ltd | Wholesale & retail | 2023 |
| Rainbow Forest Centre London Limited | Health & social care | 2022 |
| Raisio UK Limited | Professional & scientific | 2010 |
| RAJ & R Real Estate Ltd | Real estate | 2025 |
| RAJ and Elnaz Properties Ltd | Real estate | 2025 |
| Raja Kanakamedala Ltd | Financial services | 2015 |
| Rajman Estates Limited | Real estate | 2026 |
| RAM Avtar Limited | Wholesale & retail | 2025 |
| Ramark Systems Limited | Information & communication | 2024 |
| Randland Investments Ltd | Real estate | 2024 |
| Randland Ltd | Construction | 2023 |
| Raniya Ltd | Information & communication | 2025 |
| Rapidnpro Ltd | Construction | 2025 |
| Raven Entertainment Ltd | Information & communication | 2022 |
| RAW Global Media Ltd | Manufacturing | 2022 |
| Rawmgt Ltd | Real estate | 2016 |
| Raynaud & Co Limited | Information & communication | 2015 |
| RBS Service Limited | Construction | 2013 |
| RD Resolution Limited | Wholesale & retail | 2023 |
| Ready.Baby.Go. Ltd | Information & communication | 2021 |
| Readymade Companies Worldwide Ltd | Professional & scientific | 2014 |
| Readymadecompanyonline Ltd | Professional & scientific | 2012 |
| Recless Limited | Information & communication | 2019 |
| Recrew Limited | Wholesale & retail | 2020 |
| Recruitment Phase Limited | Administrative & support | 2024 |
| Red Arrow Leasing Limited | Financial services | 2003 |
| Red House Productions Ltd | Information & communication | 2022 |
| Red Miracle (Cranford) Limited | Wholesale & retail | 2005 |
| Red Miracle (Hereford) Limited | Wholesale & retail | 2007 |
| Red Miracle (Ludlow) Ltd | Wholesale & retail | 2023 |
| Red Miracle (Nuneaton) Ltd | Wholesale & retail | 2018 |
| Red Miracle (Shrewsbury) Limited | Wholesale & retail | 2007 |
| Red Miracle (Southall) Limited | Wholesale & retail | 2010 |
| Red Miracle (Wokingham) Limited | Wholesale & retail | 2003 |
| Red Miracle Battlefield Ltd | Wholesale & retail | 2015 |
| Red Miracle Limited | Wholesale & retail | 2001 |
| Red Miracle Management Ltd | Professional & scientific | 2011 |
| Red Miracle Norwood Green Ltd | Hospitality | 2018 |
| Red Miracle Properties Ltd | Real estate | 2018 |
| Red Toucan Ltd | Wholesale & retail | 2021 |
| Redmond Developments Ltd | Construction | 2013 |
| Redpoint Global Ltd | Information & communication | 2008 |
| Reese Lettings Limited | Wholesale & retail | 2020 |
| Reflective Pieces Limited | Administrative & support | 2022 |
| Reflective Time Ltd | Health & social care | 2017 |